3d/2d multi-primary color image device and method for controlling the same

ABSTRACT

A 3D/2D multi-primary color image device is provided with an optical unit to direct a first image to a first group of viewers and a second image to a second group of viewers. Each color dot of the multi-primary color image device comprises at least two color sections controlled independently. A first group of viewers and a second group of viewers can view simultaneously and respectively a first image and a second image.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a Continuation-in-Part of U.S. patentapplication Ser. No. 12/852,062, filed on Aug. 6, 2010, the entirecontents of which are hereby incorporated by reference and for whichpriority is claimed under 35 U.S.C. §120.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to an image device, and particularly to athree-dimensional (3D)/two-dimensional (2D) multi-primary color imagedevice which can display a 3D image, a 2D image and a mixed 2D/3D image,and a method for controlling the same.

2. Description of the Related Art

Display devices capable of displaying 3D images have been developed. 3Dimage display systems that have been studied so far can be classifiedinto a type which uses glasses and a type which is glass free. Wearingglasses may have negative impact on users watching 3D contents. The moreuser friendly glass free 3D image display device includes an opticalunit such as a parallax barrier, a lenticular lens or a second LCD whichis used to direct two slightly different images, one to the left eye andone to the right eye for forming a 3D image.

Recently have active studies also been made to permit a 3D image displaydevice to display a 2D image. The conventional approach is to make theaforementioned images for the left eye and for the right eye match witheach other and display the same image. Referring to FIG. 1, it shows aconventional 3D display device. The conventional 3D display device 10includes a plurality of RGB pixel groups 11 for the left eye and aplurality of RGB pixel groups 12 for the right eye. For example, the RGBpixel group 11 includes a red dot (R1) 111, a green dot (G1) 112 and ablue dot (B1) 113 for the left eye, and the RGB pixel group 12 includesa red dot (R2) 121, a green dot (G2) 122 and a blue dot (B2) 123 for theright eye. In this case, the same information should be displayed overtwo pixels, thus reducing the resolution to a half.

U.S. Pat. No. 7,705,844 teaches a method to arrange two RGB pixels in asquare instead of 1 RGB stripe pixel so that double density can beobtain in the horizontal direction, thus compensating the loss ofresolution by dividing a left image and a right image. The downside isthat the gate line number increases by three, thus reducing dramaticallythe pixel clock and TFT LCD pixels do not have enough time to be fullycharged, specially for amorphous LCD display.

U.S. Pat. No. 7,050,020 teaches a method to use 2 lenticular lenses tomaintain the full resolution in 2D display mode in shifting onelenticular lens against another lenticular lens by half a lens pitch.The problem is still the complicated construction of the display withmoving lenticular lenses, besides higher cost and easy wear and tear.

U.S. Pat. No. 8,466,954 teaches a display which alternately presentsimages from at least two video feeds and in which a synchronized,shuttered filter device is used that only permits the viewing of imagesfrom one of the video feeds. It is a time-sharing arrangement to allowmultiple viewers to view different images on the same display. Thedownside is that the frame rate is reduced and so the visual quality ofthe display is degraded.

SUMMARY OF THE INVENTION

The present invention is to provide an image device. The image deviceincludes a plurality of pixel groups. Each pixel group includes aplurality of dots arranged in a predetermined identical matrix form, andeach pixel group has at least one first color dot, at least one secondcolor dot, at least one third color dot and at least one fourth colordot. The first color dot comprises at least two first color sectionscontrolled independently, the second color dot comprises at least twosecond color sections controlled independently, the third color dotcomprises at least two third color sections controlled independently,and the fourth color dot comprises at least two fourth color sectionscontrolled independently.

The present invention is to provide a method for controlling the aboveimage device. The method of the invention comprises the steps of: (a)first sub-pixel rendering and color space converting input data for afirst image in a first color space, and outputting multi-primary colorsection signals for the first image in the second color space; and (b)second sub-pixel rendering and color space converting the input data fora second image in the first color space and outputting multi-primarycolor section signals for the second image in the second color space.

It is an object of the invention to provide a thin, simple and low-cost3D image/2D image display device which ensures seamless switchingbetween the display of a 3D image, the display of a 2D image and thedisplay of a mixed 2D/3D image with full resolution and high brightness.

It is another object of the invention to provide a multi-primary colorimage device such as RGBW using virtual pixel of one single color torepresent a full RGB color pixel by means of sub-pixel rendering andcolor space conversion.

It is another object of the invention to display multiple imagessimultaneously to multiple groups of viewers.

BRIEF DESCRIPTION OF THE DRAWING

Further advantageous measures are described in the dependent claims. Theinvention is shown in the attached drawing and is described hereinafterin greater detail.one group of viewers

FIG. 1 shows a conventional 3D display device;

FIG. 2 shows the image device according to a first embodiment of theinvention;

FIGS. 3A and 3B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the first embodiment of theinvention;

FIG. 4 shows the image device according to a second embodiment of theinvention;

FIGS. 5A and 5B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the second embodiment of theinvention;

FIG. 6 shows the image device according to a third embodiment of theinvention;

FIGS. 7A and 7B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the third embodiment of theinvention;

FIG. 8 shows a block diagram for illustrating the method for controllingthe image device according to the invention.

FIG. 9 shows the RGBW image device according to the first embodiment ofthe invention;

FIGS. 10A and 10B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the first embodiment of theinvention;

FIG. 11 shows the RGBW image device according to the second embodimentof the invention;

FIGS. 12A and 12B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the second embodiment of theinvention;

FIG. 13 shows the RGB image device according to the third embodiment ofthe invention;

FIGS. 14A and 14B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the third embodiment of theinvention; and

FIG. 15 shows the image device according to a fourth embodiment of theinvention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 2, it shows the image device according to a firstembodiment of the invention. The image device 20 includes a plurality ofpixel groups. Each pixel group includes a plurality of dots 21, 22, 23,24 arranged in a predetermined identical matrix form, and each pixelgroup has at least one first color dot 21, at least one second color dot22, at least one third color dot 23 and at least one fourth color dot24. The first color dot 21 comprises at least two first color sections211 (A1), 212 (A2) controlled independently, the second color dot 22comprises at least two second color sections 221 (B1), 222 (B2)controlled independently, the third color dot 23 comprises at least twothird color sections 231 (C1), 232 (C2) controlled independently, andthe fourth color dot 24 comprises at least two fourth color sections 241(D1), 242 (D2) controlled independently.

The image device 20 can display a 3D image, a 2D image and a mixed 2D/3Dimage. The image device 20 can further comprising an optical unitdisposed at one side of the image device and having view-separationelements arranged in the first direction into multiple rows and columns.The optical unit used in the invention can be, but is not limited to, aliquid crystal shutter, a lenticular lens or a parallax barrier.

FIGS. 3A and 3B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the first embodiment of theinvention. In FIG. 3A, one section 211(A1), 221 (B1), 231 (C1) 241 (D1)of a color dot 21, 22, 23, 24 is for displaying a first image. In FIG.3B, another section 212(A2), 222 (B2), 232 (C2) 242 (D2) of the samecolor dot 21, 22, 23, 24 is for displaying a second image. In thisembodiment, the data inputted to the one section 211(A1), 221 (B1), 231(C1) 241 (D1) of a color dot 21, 22, 23, 24 is multi-primary colorsection signals for one group of viewers, and the data inputted toanother section 212(A2), 222 (B2), 232 (C2) 242 (D2) of a color dot 21,22, 23, 24 is multi-primary color section signals for another group ofviewers.

Referring to FIGS. 3A and 3B again, the first and second images may befrom any video content, multimedia stream, computer output, game output,electronic device, or form any known means for sourcing video images.Further, the first and second images may be 2D and/or 3D.

FIG. 8 shows a block diagram for illustrating the method for controllingthe image device according to the invention. Referring to FIGS. 2, 3A,3B and 8, the image device 20 further comprises a first sub-pixelrendering and color space converting device for receiving the input datafor a first image in a first color space and outputting multi-primarycolor section signals for the first image in a second color space (FIG.3A), and further comprises a second sub-pixel rendering and color spaceconverting device for receiving the input data for a second image in thefirst color space and outputting multi-primary color section signals forthe second image in the second color space (FIG. 3B). For example, thefirst color space is RGB color space, and the second color space is ABCDcolor space (FIG. 2).

In this embodiment, each color dot represents a luminance and achrominance of a corresponding full color pixel data by grouping withneighboring dots to form a plurality of overlapping full color dynamicspixel groups. That is, a multi-primary color image device such as RGBWusing virtual pixel of one single color to represent a full RGB colorpixel by means of sub-pixel rendering and color space conversion.Compared with FIG. 1 and FIG. 2, for example the resolution of theconventional RGB 3D display device is 1920×3×1080, the resolution of theimage device 20 of the invention is 1920×2×1080. For 3D image, theresolution of the conventional RGB 3D display device for the first imageis 960×3×1080, and the resolution of the conventional RGB 3D displaydevice for the second image is 960×3×1080; the resolution of the imagedevice of the invention for the first image is 1920×1×1080, and theresolution of the image device 20 of the invention for the second imageis 1920×1×1080. For 2D image, the resolution of the conventional RGB 3Ddisplay device is 1920×3×1080, the resolution of the image device 20 ofthe invention is 1920×2×1080. Therefore, the image device 20 of theinvention can display a 2D image with additional one bit color depth byusing the 2 sections of the same color dot. The image device 20 of theinvention can provide a thin, simple and low-cost 3D image/2D imagedisplay device which ensures seamless switching between the display of a3D image, the display of a 2D image and the display of a mixed 2D/3Dimage with full resolution and high brightness.

FIG. 2 illustrates a first orientation of image device 20 with respectto a viewer of the image display. Referring to FIG. 2, at least twofirst color sections 211, 212 of image device 20 are arranged in a firstdirection, at least two second color sections 221, 222 are arranged inthe first direction, at least two third color sections 231, 232 arearranged in the first direction, and at least two fourth color sections241, 242 are arranged in the first direction. As can be seen in FIG. 2,the first direction is a horizontal direction (row direction), and oneof the at least two first color sections 212 is located directly betweenanother of the at least two first color sections 211 and one of the atleast two third color sections 231 in the row direction. On the otherhand, if the image device 20 is rotated from the first orientation(shown in FIG. 2) by ninety degrees)(90° about an axis perpendicular tothe face of image display 20, the image display 20 would be in a secondorientation with respect to a viewer, the at least two first colorsections 211, 212 of the image display 20 are arranged in a seconddirection, the at least two second color sections 221, 222 are arrangedin the second direction, the at least two third color sections 231, 232are arranged in the second direction, and the at least two fourth colorsections 241, 242 are arranged in the second direction. The seconddirection is a vertical direction (column direction), and one of the atleast two first color sections 212 is located directly between anotherof the at least two first color sections 211 and one of the at least twothird color sections 231 in the column direction.

Referring to FIG. 2 again, the second color dot 22 and the third colordot 23 have lower light intensity than the first color dot 21 and thefourth color dot 24 in a white balance status, the first color dot 21and the fourth color dot 24 are disposed on diagonal positions of thepredetermined identical matrix of the pixel group. Referring to FIGS. 9,10A and 10B, in this embodiment, the first color dot 21 is a green dot,the second color dot 22 is a blue dot, the third color dot 23 is a reddot and the fourth color dot 24 is a white dot. Further, the first colordot 21, the second color dot 22, the third color dot 23 and the fourthcolor dot 24 are quadrate shape.

Referring to FIG. 4, it shows the image device according to a secondembodiment of the invention. The image device 30 includes a plurality ofpixel groups. Each pixel group includes a plurality of dots 31, 32, 33,34 arranged in a predetermined identical matrix form, and each pixelgroup has at least one first color dot 31, at least one second color dot32, at least one third color dot 33 and at least one fourth color dot34. The first color dot 31 comprises at least two first color sections311 (A1), 312 (A2) controlled independently, the second color dot 32comprises at least two second color sections 321 (B1), 322 (B2)controlled independently, the third color dot 33 comprises at least twothird color sections 331 (C1), 332 (C2) controlled independently, andthe fourth color dot 34 comprises at least two fourth color sections 341(D1), 342 (D2) controlled independently.

FIGS. 5A and 5B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the second embodiment of theinvention. In FIG. 5A, one section 311(A1), 321 (B1), 331 (C1) 341 (D1)of a color dot 31, 32, 33, 34 is for displaying a first image. In FIG.5B, another section 312(A2), 322 (B2), 332 (C2) 342 (D2) of the samecolor dot 31, 32, 33, 34 is for displaying a second image.

Referring to FIGS. 5A and 5B again, the first and second images may befrom any video content, multimedia stream, computer output, game output,electronic device, or form any known means for sourcing video images.Further, the first and second images may be 2D and/or 3D.

Compared with FIG. 1 and FIG. 4, for example the resolution of theconventional RGB 3D display device is 1920×3×1080, the resolution of theimage device 30 of the invention is 2880×2×1080, thus only color filteris changed for adopting multi primary color structure without modifyingother components of a conventional RGB display for cost reasons. For 3Dimage, the resolution of the conventional RGB 3D display device for thefirst image is 960×3×1080, and the resolution of the conventional RGB 3Ddisplay device for the second image is 960×3×1080; the resolution of theimage device 30 of the invention for the first image is 2880×1×1080, andthe resolution of the image device of the invention for the second imageis 2880×1×1080. For 2D image, the resolution of the conventional RGB 3Ddisplay device is 1920×3×1080, the resolution of the image device of theinvention is 2880×2×1080. Therefore, the image device of the inventioncan display a 2D image with additional one bit color depth by using the2 sections of the same color dot. The image device of the invention canprovide a thin, simple and low-cost 3D image/2D image display devicewhich ensures seamless switching between the display of a 3D image, thedisplay of a 2D image and the display of a mixed 2D/3D image with fullresolution and high brightness.

Referring to FIG. 4 again, the first color dot 31, the second color dot32, the third color dot 33 and the fourth color dot 34 are rectangularshape. Referring to FIGS. 11, 12A and 12B, in this embodiment, the firstcolor dot 31 is a green dot, the second color dot 32 is a blue dot, thethird color dot 33 is a red dot and the fourth color dot 34 is a whitedot.

Referring to FIG. 6, it shows the image device according to a thirdembodiment of the invention. The image device 40 includes a plurality ofpixel groups. Each pixel group includes a plurality of dots 41, 42, 43,44 arranged in a predetermined identical matrix form, and each pixelgroup has at least one first color dot 41, at least one second color dot42, at least one third color dot 43 and at least one fourth color dot44. The first color dot 41 comprises at least two first color sections411 (A1), 412 (A2) controlled independently, the second color dot 42comprises at least two second color sections 421 (B1), 422 (B2)controlled independently, the third color dot 43 comprises at least twothird color sections 431 (C1), 432 (C2) controlled independently, andthe fourth color dot 44 comprises at least two fourth color sections 441(D1), 442 (D2) controlled independently.

FIGS. 7A and 7B show one section of a color dot is for displaying afirst image while another section of the same color dot is fordisplaying a second image according to the second embodiment of theinvention. In FIG. 7A, one section 411(A1), 421 (B1), 431 (C1) 441 (D1)of a color dot 41, 42, 43, 44 is for displaying a first image. In FIG.7B, another section 412(A2), 422 (B2), 432 (C2) 442 (D2) of the samecolor dot 41, 42, 43, 44 is for displaying a second image.

Referring to FIGS. 7A and 7B again, the first and second images may befrom any video content, multimedia stream, computer output, game output,electronic device, or form any known means for sourcing video images.Further, the first and second images may be 2D and/or 3D.

Compared with FIG. 1 and FIG. 6, for example the resolution of theconventional RGB 3D display device is 1920×3×1080, the resolution of theimage device 40 of the invention is 1920×2×1080. For 3D image, theresolution of the conventional RGB 3D display device for the first imageis 960×3×1080, and the resolution of the conventional RGB 3D displaydevice for the second image is 960×3×1080; the resolution of the imagedevice 40 of the invention for the first image is 1920×1×1080, and theresolution of the image device of the invention for the second image is1920×1×1080. For 2D image, the resolution of the conventional RGB 3Ddisplay device is 1920×3×1080, the resolution of the image device 40 ofthe invention is 1920×2×1080. Therefore, the image device of theinvention can display a 2D image with additional one bit color depth byusing the 2 sections of the same color dot. The image device of theinvention can provide a thin, simple and low-cost 3D image/2D imagedisplay device which ensures seamless switching between the display of a3D image, the display of a 2D image and the display of a mixed 2D/3Dimage with full resolution and high brightness.

Referring to FIG. 6 again, two of the color dots are small dots 41, 44,two of the color dots are big dots 42, 43, the area of the small dot issmaller than that of the big color dot. In this embodiment, the area ofthe first color dot 41 is equal to that of the fourth color dot 44, thearea of the third color dot 43 is equal to that of the second color dot42, the area of the first color dot 41 is smaller than that of the thirdcolor dot 43. In this embodiment, the sum of the two areas of the twosmaller color dots is equal to the area of one of the bigger color dot.The image device 40 of the invention can be used in OLED. However, it isdifficult to form a white dot in OLED. Referring to FIGS. 13, 14A and14B, in this embodiment, the first color dot 41 is a green dot, thesecond color dot 42 is a blue dot, the third color dot 43 is a red dotand the fourth color dot 44 is a green dot.

Referring to FIG. 15, it shows the image device according to a fourthembodiment of the invention. The image device 20 includes a plurality ofpixel groups. Each of the first pixel groups includes a plurality ofdots 21, 22, 23, 24 arranged in a predetermined identical matrix form,and each pixel group has at least one first color dot 21, at least onesecond color dot 22, at least one third color dot 23 and at least onefourth color dot 24. The first color dot 21 comprises at least two firstcolor sections 211 (A1), 212 (A2) controlled independently, the secondcolor dot 22 comprises at least two second color sections 221 (B1), 222(B2) controlled independently, the third color dot 23 comprises at leasttwo third color sections 231 (C1), 232 (C2) controlled independently,and the fourth color dot 24 comprises at least two fourth color sections241 (D1), 242 (D2) controlled independently. Each of the second pixelgroups includes a plurality of dots 25, 26, 27, 28 arranged in apredetermined identical matrix form, and each pixel group has at leastone first color dot 25, at least one second color dot 26, at least onethird color dot 27 and at least one fourth color dot 28. The first colordot 25 comprises at least two first color sections 251 (A1), 252 (A2)controlled independently, the second color dot 26 comprises at least twosecond color sections 261 (B1), 262 (B2) controlled independently, thethird color dot 27 comprises at least two third color sections 271 (C1),272 (C2) controlled independently, and the fourth color dot 28 comprisesat least two fourth color sections 281 (D1), 282 (D2) controlledindependently.

While embodiments of the present invention has been illustrated anddescribed, various modifications and improvements can be made by thoseskilled in the art. The embodiments of the present invention aretherefore described in an illustrative, but not restrictive, sense. Itis intended that the present invention may not be limited to theparticular forms as illustrated, and that all modifications whichmaintain the spirit and scope of the present invention are within thescope as defined in the appended claims.

What is claimed is:
 1. An image device, comprising: a plurality of pixelgroups, each of the pixel groups comprising: a plurality dots arrangedin a predetermined identical matrix form, each of the pixel groupshaving at least one first color dot, at least one second color dot, atleast one third color dot and at least one fourth color dot, wherein thefirst color dot comprises at least two first color sections controlledindependently, and the second color dot comprises at least two secondcolor sections controlled independently, the third color dot comprisesat least two third color sections controlled independently, and thefourth color dot comprises at least two fourth color sections controlledindependently, wherein depending on an orientation of the image displaywith respect to a viewer, one of the at least two first color sectionsof each of the pixel groups is located directly between another of theat least two first color sections and one of the at least two thirdcolor sections, in a row direction or a column direction and the datainputted to one of the at least two color sections of each color dot ismultiprimary color signals for a first group of viewers, and the datainputted to another one of the at least two color sections of each colordot is multiprimary color signals for a second group of viewers.
 2. Theimage device according to claim 1, further comprising an optical unitdisposed at one side of the image device and having view-separationelements arranged in the first direction into multiple rows and columns.3. The image device according to claim 2, wherein the optical unit is aliquid crystal shutter.
 4. The image device according to claim 2,wherein the optical unit is a lenticular lens.
 5. The image deviceaccording to claim 2, wherein the optical unit is a parallax barrier. 6.The image device according to claim 1, further comprising a firstsub-pixel rendering and color space converting device for receivinginput data for a first image in a first color space and outputtingmulti-primary color section signals for the first image in a secondcolor space.
 7. The image device according to claim 6, furthercomprising a second sub-pixel rendering and color space convertingdevice for receiving input data for a second image in the first colorspace and outputting multi-primary color section signals for the secondimage in the second color space.
 8. The image device according to claim1, wherein the two first color sections are arranged in a firstdirection, the two second color sections are arranged in the firstdirection, the two third color sections are arranged in the firstdirection, the two fourth color sections are arranged in the firstdirection.
 9. The image device according to claim 1, wherein the twofirst color sections are arranged in a second direction, the two secondcolor sections are arranged in the second direction, the two third colorsections are arranged in the second direction, the two fourth colorsections are arranged in the second direction.
 10. The image deviceaccording to claim 1, wherein each of the color dots represents aluminance and a chrominance of a corresponding full color pixel data bygrouping with neighboring dots to form a plurality of overlapping fullcolor dynamic pixel groups.
 11. The image device according to claim 1,wherein the second color dot and the third color dot have lower lightintensity than the first color dot and the fourth color dot in a whitebalance status, and the first color dot and the fourth color dot aredisposed on diagonal positions of the predetermined identical matrix ineach of the pixel groups.
 12. The image device according to claim 11,wherein the first color dot, the second color dot, the third color dotand the fourth color dot are quadrate shaped.
 13. The image deviceaccording to claim 11, wherein the first color dot, the second colordot, the third color dot and the fourth color dot are rectangularshaped.
 14. The image device according to claim 11, wherein the firstcolor dot is a green dot, the second color dot is a blue dot, the thirdcolor dot is a red dot and the fourth color dot is a white dot.
 15. Theimage device according to claim 11, wherein two of the color dots aresmall color dots, two of the color dots are big color dots, so that anarea of each of the two small color dots is smaller than that of each ofthe two big color dots.
 16. The image device according to claim 15,wherein the area of the first color dot is equal to that of the fourthcolor dot, the area of the third color dot is equal to that of thesecond color dot, and the area of the first color dot is smaller thanthat of the third color dot.
 17. The image device according to claim 16,wherein a sum of the two areas of the two small color dots is equal tothe area of one of the big color dots.
 18. The image device according toclaim 17, wherein the first color dot is a green dot, the second colordot is a blue dot, the third color dot is a red dot and the fourth colordot is a green dot.
 19. A method for controlling the image device asclaimed in claim 1, comprising the steps of: (a) first sub-pixelrendering and color space converting the input data for a first image ina first color space, and outputting multi-primary color section signalsfor the first image in the second color space; and (b) second sub-pixelrendering and color space converting the input data for a second imagein the first color space and outputting multi-primary color sectionsignals for the second image in the second color space.
 20. An imagedevice, comprising: a plurality of pixel groups, each of the pixelgroups comprising: a plurality dots arranged in a predeterminedidentical matrix form, each of the pixel groups having at least onefirst color dot, at least one second color dot, at least one third colordot and at least one fourth color dot, wherein the first color dotcomprises at least two first color sections controlled independently,and the second color dot comprises at least two second color sectionscontrolled independently, the third color dot comprises at least twothird color sections controlled independently, and the fourth color dotcomprises at least two fourth color sections controlled independently,wherein depending on an orientation of the image display with respect toa viewer, one of the at least two first color sections of each of thepixel groups is located directly between another of the at least twofirst color sections and one of the at least two third color sections,and the first color dot and the second color dot in first pixel groupsand the first color dot and the second color dot in second pixel groupsare arranged alternately, in a row direction or a column direction. 21.The image device according to claim 20, wherein depending on anorientation of the image display with respect to a viewer, the thirdcolor dot and the fourth color dot in first pixel groups and the thirdcolor dot and the fourth color dot in second pixel groups are arrangedalternately, in a row direction or a column direction.